I can turn it on and off using the power switch. I only let it build up to around 80 pounds . I do here air leaking ,put when it gets down to around 40 pounds it will shut off.After it reaches 80 pounds I have unplug it and the 2 contacts on top of switch if I take a screw driver and close them manually it doesn't leak any air, if I let off the 2 contacts it starts to leak air again. I haven't yet seen the pressure safety pop off go off , put I have open it manually to see if it works

If you shut if off at 80 psi it will never activate the safety pop off because it will only pop when it reaches 5 psi above the target psi set for the air commpressor to normally shut off at. It sounds like the pressure switch diaphragm is leaking but it should be leaking all the time. You also may want to check the outlet pressure regulator and change its setting for the outlet pressure to see if the leaking pressure will also change.

well I'm not sure what the set point is, scared to let it build up that far.well try it today and let it build up tp 120 pounds and see if it's letting the safety pop is working . if you don't get a respond for me it's been nice talking to you lol just joking. well let you know what happened

Thank you for the update. The pressure tanks on these air compressors are rated for 300 psi burst.

Most of the single stage air compressors target air pressure, depending on models are somewhere between 125 psi to 150 psi.It your air compressor is in good shape it will build pressure to about 20 % past the target pressure and at 5 psi beyond the target pressure it will pop off bleed down and reset it self.

found our why the air is not shutting off , where the shaft comes out are two power starter and in the middle is a switch , the brackets have broken off and was not by the shaft, put it back on useing some plastic ties ,I did let it pump up to 100 pounds and shut it off using the off and on switch , On the back side of the switch is a fitting has a small tube on it comming from the tee from the tank , air does come out of this fitting, took apart could not get fitting out , put back together , and called it a day. What are must target pressureset at .It's 25 gal tank and 1 5.5 hp

Thank you for the update. No, the pressure regulator only regulates the air coming out of the supply hose to the tools. It is adjustable for different tool requirements for air pressure to operate that tool.

The air pressure electrical switch is what determines when the compressor shuts off at a pre-determined setting of the switch. If your air compressor model say's that its target psi is 125 psi that is when the pressure switch should shut off the motor.

I am sorry if I was unclear before. The terms pressure switch and pressure regulator can be confusing as to what there intent.